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17. Which of the following is/are side effects of scan conversion?
a. Aliasing
b. Unequal intensity of diagonal lines
c. Over striking in photographic applications
d. Local or Global aliasing

(1) a and b
(2) a, b and c
(3) a, c and d
(4) a, b, c and d

asked in CBSE/UGC NET by Active (3.9k points) | 850 views

2 Answers

+2 votes
Best answer

Aliasing effects occur due to bad sampling of scan lines over the object. This occurs due to discontinuity of objects and scanning is restricted at integer values.

During the scan conversion, same pixel may be unneccesarily plotted multiple times which causes overstriking.

Unequal intensity occurs due to uneven brightness of the object during scan conversion.

Scan converting object normally into the image space will result in uneven distances between pickets since the endpoints will have to be snapped to pixel coordinates. This is sometimes called global aliasing, as the overall length of the picket fence is approximately correct. On the other hand an attempt to maintain equal spacing will greatly distort the overall length of the fence. This is sometimes called local aliasing, as the distances between pickets are kept close to their true distances.

Hence option (4).

answered by Active (1.8k points)
selected by
what about 4th point.. local and global aliasing.. where as 1st point is only aliasing
See the link, I updated the answer.
yep thnx

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